630906521 has 16 divisors (see below), whose sum is σ = 737441280. Its totient is φ = 528506880.

The previous prime is 630906517. The next prime is 630906569. The reversal of 630906521 is 125609036.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 630906521 - 2² = 630906517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (630906421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 447065 + ... + 448473.

It is an arithmetic number, because the mean of its divisors is an integer number (46090080).

Almost surely, 2^630906521 is an apocalyptic number.

It is an amenable number.

630906521 is a deficient number, since it is larger than the sum of its proper divisors (106534759).

630906521 is a wasteful number, since it uses less digits than its factorization.

630906521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2824.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 630906521 is about 25117.8526351279. The cubic root of 630906521 is about 857.6728688983.

The spelling of 630906521 in words is "six hundred thirty million, nine hundred six thousand, five hundred twenty-one".